How do mosquitoes sting?

in the back of its body see if you aggravate it it will land on you push down the abdomen at the back of its body and release the stinger into you're body but it will take the stinger back so it can release the stinger once again (but it can sting you more than just twice) but if you don't aggravate it or pass into its property it will not have a reason to sting or hurt you